X15 Performance Series (2017)


X15 Performance Series (2017)

Redefining Performance. Increasing Value.

You want power? You want performance? You want reliability and durability? You can’t do better than Cummins X15. Plus, you get the best fuel economy in the industry and the longest maintenance intervals, for lower maintenance costs. Connected Diagnostics that accelerate service accuracy and speed. Top that off with the largest, most capable parts and service network in the industry. It’s a total package that adds up to the best resale value of any engine in the industry. With a Total Cost of Ownership that makes the competition look like a tiny speck out the side-view mirror.

We wrote the book on high-performance diesel engines. The Record Book.

It began as a radically innovative platform, complete with dual overhead cams, exceptionally strong engine braking and an even tougher head and block, for unrivaled dependability. The Cummins ISX15 rapidly outpaced the competition, becoming the industry’s dominant big-bore engine over the past three decades.

But at Cummins, we’re never satisfied with the status quo. So virtually every critical component, including the power cylinder, camshaft, turbo and fuel system, has been scrutinized, modified, upgraded and improved. All that makes the 2017 X15 a completely reinvented platform that delivers the best performance and dependability in the industry.

These enhancements improve air handling, for faster throttle response plus even stronger braking power at lower RPM. In addition to delivering the rewarding performance drivers want, the X15 delivers superior fuel economy over competitive engines. So you can blow past other trucks – as well as diesel stops.

Brawn And Brains.

The value that Cummins is bringing to the trucking industry goes well beyond engine hardware. With the X15, Cummins is bringing the next evolution in remote connections with our Connected Solutions™ telematics features. In addition to our proven Connected Diagnostics system, we’re introducing Connected Calibrations,™ with Over-the-Air (OTA) engine customization.


600 Braking Horsepower From An Engine. Believe It.

The X15 is optimized to deliver the power to get you past traffic and over the next hill with 485 to 605 hp and 1650 to 2050 lb-ft of peak torque. That is more than enough to get you off the line, down the road, and up the steepest hill. But what’s really impressive is what happens when you crest the hill and take your foot off the accelerator. That’s when the most powerful engine brake in the industry kicks in, and you just ease on down the road.

Advertised Horsepower 485-605 hp 362-451 kW
Peak Torque 1650-2050 lb-ft 2237-2779 N•m
Governed Speed 2000 rpm
Clutch Engagement Torque 1000 lb-ft 1356 N•m
Number of Cylinders 6
System Weight 3,152 lb 1,430 kg
Engine (Dry) 2,961 lb 1,343 kg
Aftertreatment System* 191 lb 87 kg

Engine Finder Specifications

Certification Level EPA 2017
Power 485 - 605 hp / 362 - 451 kW
Torque 1650 - 2050 lb-ft / 2237 - 2779 N•m


X15 Performance Ratings.

With ratings up to 605 hp and 2050 lb-ft, the X15 Performance Series has the power and torque to conquer whatever you throw at it.

Engine Model Power - hp (kW) Peak Torque - lb-ft (N•m) @ rpm
X15 605 605 (451) 2050 (2779) @ 1150
X15 605 605 (451) 1850 (2508) @ 1150
X15 565 565 (421) 2050 (2779) @ 1150
X15 565 565 (421) 1850 (2508) @ 1150
X15 525 525 (392) 1850 (2508) @ 1200
X15 505 505 (376) 1850 (2508) @ 1200
X15 505 505 (376) 1650 (2237) @ 1200
X15 485 485 (362) 1850 (2508) @ 1200
X15 485 485 (362) 1650 (2237) @ 1200


VGT® Turbocharger From Cummins Turbo Technologies

This turbocharger has variable geometry, for precision and responsiveness. The actuator is four to six times stronger than that of previous versions, for even better dependability. An enhanced design with a new impeller provides rapid boost and improved engine braking.

XPI Fuel System From Cummins Fuel Systems

The XPI system delivers superior performance, regardless of engine rpm. Multiple injection events per cycle improve fuel efficiency and enable smoother, quieter operation. Steel plungers and diamond like coated roller tappets make this the toughest XPI fuel system to date.

Single Module™ Aftertreatment System From Cummins Emission Solutions

A flow-through design offers better heat management, for improved efficiency. Increased ash capacity means fewer cleanings. And it’s up to 40 percent lighter and 60 percent smaller than two-part systems.

Fleetguard® Fuel Filters And Lube Filters From Cummins Filtration

These filters protect against corrosion and contaminants that can cause performance issues. The Fleetguard LF 14000NN lube filter provides less restriction, for faster flow and better cold-start capability, while still trapping nearly 99 percent of particles down to 4 microns.

High-Capacity Electronic Control Module (ECM)

The robust ECM manages the engine and aftertreatment system simultaneously, for optimum performance and fuel efficiency.

Cummins Engine Brake

The most powerful engine brake in the industry offers up to 600 bhp, adding control on downhill grades, and helping reduce service brake wear, downtime and replacement costs.

Connected Diagnostics™

This feature uses telematics to wirelessly connect the engine to Cummins for rapid fault diagnosis. It enables continued operation without risk in most events, maximizing uptime.

Power Cylinder Improvements

Combustion’s hot. That’s bad for your oil. The X15 incorporates an enhanced piston design that reduces the transfer of heat to the oil, increasing both durability and oil-drain intervals.


Say “No” To High Maintenance, “Yes” To Long Life.

Don’t sweat the numbers. This engine doesn’t need to be babied. With longer maintenance intervals, the less time your trucks spend in the shop, and the more loads you can carry. So instead of bleeding your wallet dry, you’re stuffing it instead. It gives new meaning to “win/win.”

Item Severe
< 5.5 mpg
5.5-6.5 mpg
>6.5 mpg
Oil Drain Interval 25,000 Mi
40,000 Km
35,000 Mi
56,000 Km
50,000 Mi
80,000 Km
Oil Drain with OilGuard1 -- -- Up to 80,000 Mi
130,000 Km
Fuel St 1 Filter 25,000 Mi
40,000 Km
35,000 Mi
56,000 Km
50,000 Mi
80,000 Km
Fuel St 2 Filter 25,000 Mi
40,000 Km
35,000 Mi
56,000 Km
50,000 Mi
80,000 Km
Diesel Particulate Filter2 250,000-400,000 Mi
400,000-640,000 Km
400,000-600,000 Mi
640,000-960,000 Km
600,000-800,000 Mi
960,000-1,300,000 Km

DEF Filter

250,000 Mi
400,000 Km
280,000 Mi
448,000 Km
300,000 Mi
480,000 Km
Valve Adjustment 500,000 Mi
800,000 Km
500,000 Mi
800,000 Km
500,000 Mi
800,000 Km

Brochures Available

Title Bulletin Number Request View  
2017 X15 Performance Series Brochure 5410583 Request View  Download
2017 X15 Performance Series Brochure - French 5410597 Request View  Download
X Series Euro VI Brochure – A4 Format 5410607 View  Download
X15 Performance Series - Mexico View  Download

Torque & Horsepower Curves

Want To Kick Some Butt On Hills? We Thought so.

The 2017 X15 delivers power on the hills like a hot rod coming off the starting line. With ratings from 485 hp to 605 hp and available torque up to 2050 lb-ft, this is the most powerful engine available in a truck. The extra muscle of 15 liters means that the X15 doesn’t have to work as hard pulling the load, so you’ve got an engine that’s going to use less fuel, last longer and be worth more at the end of the run. Yeah, going big pays big dividends. But you already knew that.

Braking Horsepower

"Not only does the performance package have great pulling power, but the stopping power is second to none. The engine braking is phenomenal."  – Frank Madril, Cummins Redefining Tour Driver